1、BSI Standards PublicationBS EN 50289-1-17:2015Communication cables Specifications for test methodsPart 1- 17: Electrical test methods Exogenous Crosstalk ExNEXT and ExFEXTBS EN 50289-1-17:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 50289-1-17:2015. The
2、UK participation in its preparation was entrusted to TechnicalCommittee EPL/46, Cables, wires and waveguides, radio frequencyconnectors and accessories for communication and signalling.A list of organizations represented on this committee can beobtained on request to its secretary.This publication d
3、oes not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 85924 3ICS 33.120.10Compliance with a British Standard cannot confer immunity fromlegal
4、 obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 50289-1-17:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50289-1-17 Novemb
5、er 2015 ICS 33.120.10 English Version Communication cables - Specifications for test methods - Part 1-17: Electrical test methods - Exogenous Crosstalk ExNEXT and ExFEXT Cbles de communication - Spcifications des mthodes dessai - Partie 1-17: Mthodes dessais lectriques - Diaphonie exogne ExNEXT et E
6、xFEXT Kommunikationskabel - Spezifikationen fr Prfverfahren - Teil 1-17: Elektrische Prfverfahren - Externes Nebensprechen ExNEXT und ExFEXT (Nebensprechen zwischen Kabeln) This European Standard was approved by CENELEC on 2015-09-28. CENELEC members are bound to comply with the CEN/CENELEC Internal
7、 Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENE
8、LEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official
9、 versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malt
10、a, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC M
11、anagement Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50289-1-17:2015 EBS EN 50289-1-17:2015EN 50289-1-17:2015 (E) 2 Contents European foreword . 3 1 Scope 4 2 Normative references
12、4 3 Terms and definitions . 4 3.1 exogenous near end crosstalk (NEXT) 4 3.2 exogenous far end crosstalk 4 3.2.1 exogenous input/output-FEXT . 4 3.2.2 equal level far end crosstalk (ExACR-F) 5 3.3 Power Sum (PS) 5 4 Test method . 5 4.1 Equipment . 5 4.2 Test sample . 5 4.3 Test procedure 5 4.3.1 Gene
13、ral 5 4.3.2 ExNEXT, PSExNEXT 5 4.3.3 ExFEXT, ExACR-F, PSExACR-F . 5 5 Test report 6 Annex A NEXT scaling factor 7 Bibliography 8 BS EN 50289-1-17:2015 EN 50289-1-17:2015 (E) 3 European foreword This document (EN 50289-1-17:2015) has been prepared by SC46 XC “Multicore, multipair and quad data commun
14、ication cables” of CLC/TC 46X “Communication cables”. The following dates are fixed: latest date by which this document has tobe implemented at national level bypublication of an identical nationalstandard or by endorsement(dop) 2016-09-28 latest date by which the national standardsconflicting with
15、thisdocument have to be withdrawn(dow) 2018-09-28 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. This document has been prepared unde
16、r a mandate given to CENELEC by the European Commission and the European Free Trade Association. _ BS EN 50289-1-17:2015EN 50289-1-17:2015 (E) 4 1 Scope Part 1-17 of EN 50289 details the test methods used to determine the cable to cable (exogenous) crosstalk between 4 pair cables used in analogue an
17、d digital communication systems. These exogenous Crosstalk effects are near end crosstalk (ExNEXT), far end crosstalk (ExFEXT), equal level far end crosstalk (ExELFEXT). This document should be read in conjunction with EN 50289-1-1, which contains essential provisions for its application. Reference
18、is made also to EN 50289-1-10 in which the definitions and test methods for crosstalk is given. The exogenous crosstalk test method is described, as well as the treatment of the results to simulate the installation condition of a disturbed cable in contact with six disturbing cables. 2 Normative ref
19、erences The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
20、 EN 50290-1-2, Communication cables Part 1-2: Definitions IEC 61156-1:2007, Multicore and symmetrical pair/quad cables for digital communications Part 1: Generic specification 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 50290-1-2 together with the
21、 following apply. 3.1 exogenous near end crosstalk (NEXT) when tested in accordance with 6.3.7 to 6.3.9 of IEC 61156-1:2007 ExNEXT = 10 LOG10(P1N/P2N) (dB) (1) Where P1N= input power into the disturbing pair; P2N= output power of the disturbed pair cable at near end, where the disturbing and disturb
22、ed pairs are in different cables; ExNEXT = exogenous near end crosstalk. 3.2 exogenous far end crosstalk 3.2.1 exogenous input/output-FEXT Ex IO FEXT = 10 LOG10(P1N/P2F) (dB) (2) Where BS EN 50289-1-17:2015 EN 50289-1-17:2015 (E) 5 P1N= input power into the disturbing pair at the near end; P2F= outp
23、ut power of the disturbed pair at far end, where the disturbing and disturbed pairs are in different cables; IO FEXT = far end crosstalk. 3.2.2 equal level far end crosstalk (ExACR-F) ExACR-F = 10 LOG10(P1F/P2F) (dB) (3) Where P1F= output power of the disturbing pair at the far end ; P2F= output pow
24、er of the disturbed pair at far end, where the disturbing and disturbed pairs are in different cables EL FEXT = IO FEXT - L L = measured attenuation of the disturbed pair of the CUT 3.3 Power Sum (PS) it describes the influence on one circuit of the rest of the circuits, when each of these is fed wi
25、th the input power P1Nand is calculated 4 Test method 4.1 Equipment To be in accordance with that described in 6.3.7 to 6.3.9 of IEC 61156-1:2007. 4.2 Test sample to be in accordance with that specified in 6.3.7 to 6.3.9 of IEC 61156-1:2007. 4.3 Test procedure 4.3.1 General To be carried out in acco
26、rdance with 6.3.7 to 6.3.9 of IEC 61156-1:2007. 4.3.2 ExNEXT, PSExNEXT To be determined in accordance with 6.3.7 to 6.3.9 of IEC 61156-1:2007. 4.3.3 ExFEXT, ExACR-F, PSExACR-F To be determined in accordance with 6.3.7 to 6.3.9 of IEC 61156-1:2007. BS EN 50289-1-17:2015EN 50289-1-17:2015 (E) 6 5 Test
27、 report The test report shall give the test conditions: - temperature; - frequency range; and record the crosstalk as required. ACR may be given when requested. BS EN 50289-1-17:2015 EN 50289-1-17:2015 (E) 7 Annex A NEXT scaling factor Formula for scaling NEXT results on short lengths to 100 m: (A.1
28、) Where: Nx = NEXT dB/100m; No = NEXT on the short cable length dB/cable length; = attenuation nepers/m; Lo = cable length m; Lx = 100 m. At high frequencies the difference between 30 m and 100 m results for NEXT are negligible. However, at lower frequency the differences range from 3,9 dB at 1 MHz
29、up to 0,1 dB at 200 MHz. Either the limit should change or the factor should be added to the result to account for the short measurement length. BS EN 50289-1-17:2015EN 50289-1-17:2015 (E) 8 Bibliography EN 50289-1-1, Communication cables Specifications for test methods Part 1-1: Electrical test met
30、hods General requirements EN 50289-1-8, Communication cables Specifications for test methods Part 1-8: Electrical test methods Attenuation EN 50289-1-10, Communication cables Specifications for test methods Part 1-10: Electrical test methods Crosstalk This page deliberately left blankBSI is the nati
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